Vulnerability-Lookup

OESA-2021-1068 (CVE-2020-27783)

Vulnerability from osv_openeuler – Published: 2021-03-05 11:04 – Updated: 2026-08-06 11:04 – Source website

Summary

python-lxml security update

Details

The lxml XML toolkit is a Pythonic binding for the C libraries libxml2 and libxslt. It is unique in that it combines the speed and XML feature completeness of these libraries with the simplicity of a native Python API, mostly compatible but superior to the well-known ElementTree API. The latest release works with all CPython versions from 2.7 to 3.7.

Security Fix(es):

A XSS vulnerability was discovered in python-lxml's clean module. The module's parser didn't properly imitate browsers, which caused different behaviors between the sanitizer and the user's page. A remote attacker could exploit this flaw to run arbitrary HTML/JS code.(CVE-2020-27783)

Severity

6.1 (Medium)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

References

URL

Type

	https://openeuler.org/en/security/safety-bulletin…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2020-27783	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "python-lxml-debugsource-4.5.2-2.oe1.aarch64.rpm",
          "python2-lxml-4.5.2-2.oe1.aarch64.rpm",
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        ],
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          "python3-lxml-4.5.2-2.oe1.x86_64.rpm",
          "python2-lxml-4.5.2-2.oe1.x86_64.rpm"
        ]
      },
      "package": {
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        "name": "python-lxml",
        "purl": "pkg:rpm/openEuler/python-lxml\u0026distro=openEuler-20.03-LTS"
      },
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          "events": [
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              "introduced": "0"
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            {
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        }
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          "python3-lxml-4.5.2-2.oe1.x86_64.rpm",
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            }
          ],
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        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Medium"
  },
  "details": "The lxml XML toolkit is a Pythonic binding for the C libraries libxml2 and libxslt. It is unique in that it combines the speed and XML feature completeness of these libraries with the simplicity of a native Python API, mostly compatible but superior to the well-known ElementTree API. The latest release works with all CPython versions from 2.7 to 3.7.\r\n\r\nSecurity Fix(es):\r\n\r\nA XSS vulnerability was discovered in python-lxml\u0027s clean module. The module\u0027s parser didn\u0027t properly imitate browsers, which caused different behaviors between the sanitizer and the user\u0027s page. A remote attacker could exploit this flaw to run arbitrary HTML/JS code.(CVE-2020-27783)",
  "id": "OESA-2021-1068",
  "modified": "2026-08-06T11:04:18Z",
  "published": "2021-03-05T11:04:18Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1068"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-27783"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "python-lxml security update",
  "upstream": [
    "CVE-2020-27783"
  ]
}

CVE-2020-27783 (GCVE-0-2020-27783)

Vulnerability from cvelistv5 – Published: 2020-12-03 16:39 – Updated: 2025-12-17 21:02

Summary

Severity

6.1 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-12-17 21:02 UTC

CWE

CWE-79

Assigner

redhat redhat root Scorecard

References

8 references

URL	Tags
https://bugzilla.redhat.com/show_bug.cgi?id=1901633	x_refsource_MISC
https://www.debian.org/security/2020/dsa-4810	vendor-advisoryx_refsource_DEBIAN
https://lists.debian.org/debian-lts-announce/2020…	mailing-listx_refsource_MLIST
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://www.oracle.com//security-alerts/cpujul2021.html	x_refsource_MISC
https://advisory.checkmarx.net/advisory/CX-2020-4286	x_refsource_MISC
https://security.netapp.com/advisory/ntap-2021052…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
n/a	python-lxml	Affected: lxml-4.6.2

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

OESA-2021-1068 (CVE-2020-27783)

CVE-2020-27783 (GCVE-0-2020-27783)

Tags

Sightings

Nomenclature

Related by attack behaviour